Therapeutic Effects of R-IDARAM and Intrathecal Immunochemotherapy on Elderly Patients With PCNSL

Inclusion Criteria: * Newly diagnosed histologically proven non-Hodgkin's lymphoma (NHL). Exclusion Criteria: * Involved sites other than the brain, meninges, CSF, or the eyes. * Age less than 18 years or greater than 75 years. * Inadequate bone marrow capacity (defined as neutrophils\<1.5 ×10\^9/L, platelets \<100 ×10\^9/L, and hemoglobin level\< 8 g/dL). * Known cause of immunosuppression (ie, HIV type I infection). * Any previous malignancy. * Creatinine clearance below 60 mL/min. * Heart insufficiency (NYHA IIIB or IV). * Uncontrolled infection. * Noncompensated active pulmonary or liver disease. * Previously treated for PCNSL, except by corticosteroids.